中文摘要：

应用统一的格子-Boltzmann模型对微尺度平板均匀通道、壁面粗糙元通道、壁面非均匀非对称电势分布以及壁面非均匀对称电势分布四类通道中电渗驱动流的外加电场分布、溶液电势分布、流场以及混合物浓度在同一框架内进行了数值模拟。数值分析表明：与平板均匀通道相比，三类强化通道都能在一定程度上强化电渗混合，但是由于流动阻力增加，混合时间的延长对混合强化的作用不可忽略。所研究的三类强化通道中，壁面布置粗糙元通道能够在增加混合时间较小的前提下，获得较高的混合强度。

英文摘要：

The lattice Boltzmann method has been conducted to simulate the external electric field, electric potential distribution in the electrolyte, the flow field and the species concentration distribution for electroosmotic flow in four typical types of microchannels including uniform plate channel, wall block channel, asymmetric heterogeneous wall potential and symmetrical heterogeneous wall potential channels. The simulation results show that the three types of enhancement channels can enhance the electroosmotic mixing to some extent. However, due to increase of the flow resistance, the mixing time is extended, which will result in a non-negligible effect on the mixing enhancement. In the studied three types of enhanced channels, microchannel with wall blocks can achieve more effective mixing efficiency within the less extension of the mixing time.